Lock down Microsoft Office 365 to Symantec.cloud IP address ranges

Article Id:178492

Status:Published

Updated On:20-12-2018 11:25

Legacy Id:HOWTO107389

Products:

Email Security.cloud

Issue/Introduction:

Resolution:

To restrict the flow of email between your Office 365 organization and the Symantec.cloud service, set up connectors in Exchange Online or Exchange Online Protection (EOP) to use only the Symantec.cloud IP address range.

Click the plus symbol (+) again to enter additional Symantec.cloud IP address ranges, in CIDR notation, until you have entered all Symantec.cloud IP address ranges in Table 1.

IPV4 IP addresses and Classless Inter-Domain Routing (CIDR)

IPV4 IP addresses must be specified in the format nnn.nnn.nnn.nnn, where nnn is a number from 0 to 255.

You can also specify Classless Inter-Domain Routing (CIDR) ranges in the format nnn.nnn.nnn.nnn/rr, where rr is a number from 24 to 32, as shown in Table 1. To help you with this, we have provided all Symantec.cloud IP address ranges up to /24 for each region below.

Table 1 Symantec.cloud IP address ranges to /24 - All regions

216.82.240.0/24

216.82.241.0/24

216.82.242.0/24

216.82.243.0/24

216.82.244.0/24

216.82.245.0/24

216.82.246.0/24

216.82.247.0/24

216.82.248.0/24

216.82.249.0/24

216.82.250.0/24

216.82.251.0/24

216.82.252.0/24

216.82.253.0/24

216.82.254.0/24

216.82.255.0/24

85.158.136.0/24

85.158.137.0/24

85.158.138.0/24

85.158.139.0/24

85.158.140.0/24

85.158.141.0/24

85.158.142.0/24

85.158.143.0/24

67.219.240.0/24

67.219.241.0/24

67.219.242.0/24

67.219.243.0/24

67.219.244.0/24

67.219.245.0/24

67.219.246.0/24

67.219.247.0/24

67.219.248.0/24

67.219.249.0/24

67.219.250.0/24

67.219.251.0/24

67.219.252.0/24

67.219.253.0/24

67.219.254.0/24

67.219.255.0/24

95.131.104.0/24

95.131.105.0/24

95.131.106.0/24

95.131.107.0/24

95.131.108.0/24

95.131.109.0/24

95.131.110.0/24

95.131.111.0/24

46.226.48.0/24

46.226.49.0/24

46.226.50.0/24

46.226.51.0/24

46.226.52.0/24

46.226.53.0/24

46.226.54.0/24

46.226.55.0/24

117.120.16.0/24

117.120.17.0/24

117.120.18.0/24

117.120.19.0/24

117.120.20.0/24

117.120.21.0/24

117.120.22.0/24

117.120.23.0/24

193.109.254.0/24

193.109.255.0/24

194.106.220.0/24

194.106.221.0/24

195.245.230.0/24

195.245.231.0/24

103.9.96.0/24

103.9.97.0/24

103.9.98.0/24

103.9.99.0/24

Creating connectors using a PowerShell script

To speed up the process of entering IP addresses, you can use the following PowerShell script.